fill

pub fn fill(self: *Pcg, buf: []u8) void {
    var i: usize = 0;
    const aligned_len = buf.len - (buf.len & 3);

    // Complete 4 byte segments.
    while (i < aligned_len) : (i += 4) {
        var n = self.next();
        comptime var j: usize = 0;
        inline while (j < 4) : (j += 1) {
            buf[i + j] = @as(u8, @truncate(n));
            n >>= 8;
        }
    }

    // Remaining. (cuts the stream)
    if (i != buf.len) {
        var n = self.next();
        while (i < buf.len) : (i += 1) {
            buf[i] = @as(u8, @truncate(n));
            n >>= 8;
        }
    }
}